Thanks to the small throttle losses ammonia significantly better than for example R-12,and more the higher the condensing temperature.At 80C difference is approx.17%.For R-134a is the ratio of reverse, with approx.9%lower power factor than R-12 at 80C.The reason can be solely attributed to greater process losses. In Figure 1.30 is shown as the power factor of R-22,R-134a and ammonia for one-step and two-stage heat pump cycle in terms of power factor for a one-step R717 process.Efficiency curves for ammonia is assumed to be 8%higher than for the two halocarbons. 1,15 1,1 1,05 R134a R134a(2) 0,95 R22 R22(2) 0,9 R717(2) 0,85 0,8 40 45 50 55 60 65 70 75 80 Figure 1.30 The relationship between power factor of one-and two-step process(Index 2 refer to, respectively,two-step process). 1,5 1,4 1.3 1.2 R134a 1,1 -R134a(2) R22 1 -R22(2) R717(2) -R410a 0.9 R410a(2) 0,8 07 -35 -30 -25 -20 -15 -10 The figure clearly shows the potential for utilization of ammonia,especially in two-stage system.COP for two stage ammonia is the highest for give diapason of condensing and evaporation temperatures.Thanks to the small throttle losses ammonia significantly better than for example R-12, and more the higher the condensing temperature. At 80 ° C difference is approx. 17%. For R-134a is the ratio of reverse, with approx. 9% lower power factor than R-12 at 80 ° C. The reason can be solely attributed to greater process losses. In Figure 1.30 is shown as the power factor of R-22, R-134a and ammonia for one-step and two-stage heat pump cycle in terms of power factor for a one-step R717 process. Efficiency curves for ammonia is assumed to be 8% higher than for the two halocarbons. Figure 1.30 The relationship between power factor of one-and two-step process (Index 2 refer to, respectively, two-step process). The figure clearly shows the potential for utilization of ammonia, especially in two-stage system. COP for two stage ammonia is the highest for give diapason of condensing and evaporation temperatures